Was associated with the Molengraaff Institute for Private Law, part of the Department of Law (Faculty of Law, Economics, Management and Organization [REBO]), since 1987 working as a full professor in the field of private law, in particular civil law and intellectual property law, more specifically copyright law.
Was guest lecturer a.o. at Wayne State 木瓜福利影视 Law School, Detroit (USA); Berkely Centre for Law and Technology, Berkely (USA); Institute of Intellectual Property, Tokyo (Japan); Stockholm 木瓜福利影视, Sweden; Washington 木瓜福利影视 School of Law (USA); Fordham 木瓜福利影视 (USA); 木瓜福利影视 of South Africa, Pretoria (S-A); Stellenbosch 木瓜福利影视 (Z-A); 木瓜福利影视 of Chinese Academy of Social Sciences, Beijing (Ch).
Was established as a practising lawyer in Amsterdam with Hocker Advocaten, Van Doorne Advocaten, and VersteegWigmanSprey Advocaten.